diff --git a/packages/oneclient_core/src/java/checker.rs b/packages/oneclient_core/src/java/checker.rs
index c1cca32c..8257a903 100644
--- a/packages/oneclient_core/src/java/checker.rs
+++ b/packages/oneclient_core/src/java/checker.rs
@@ -37,31 +37,39 @@ pub async fn check_java_runtime(absolute_path: String) -> JavaResult<JavaCheckIn
     let output = command.output().await
         .map_err(|e| JavaError::RuntimeCheckError {
             source: e,
-            path: absolute_path,
+            path: absolute_path.clone(),
         })?;
 
     let java_info = String::from_utf8_lossy(&output.stdout);
 
     let info = java_info
         .lines()
-        .map(|line| {
+        .filter_map(|line| {
             let mut parts = line.splitn(2, '=');
-            let key = parts.next().unwrap_or("unknown");
-            let value = parts.next().unwrap_or("unknown");
+            let key = parts.next()?;
+            let value = parts.next()?;
 
-            (key.to_string(), value.to_string())
+            Some((key.to_string(), value.to_string()))
         })
         .collect::<HashMap<_, _>>();
 
+    let Some(version) = info.get("java.version").cloned() else {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        tracing::warn!(
+            path = %absolute_path,
+            status = ?output.status.code(),
+            "java probe did not report java.version; stderr: {}",
+            stderr.trim()
+        );
+        return Err(JavaError::InvalidJavaPath { path: absolute_path });
+    };
+
     Ok(JavaCheckInfo {
         os_arch: info
             .get("os.arch")
             .cloned()
             .unwrap_or_else(|| String::from("unknown")),
-        version: info
-            .get("java.version")
-            .cloned()
-            .unwrap_or_else(|| String::from("unknown")),
+        version,
         vendor: info
             .get("java.vendor")
             .cloned()
diff --git a/packages/oneclient_core/src/java/manager.rs b/packages/oneclient_core/src/java/manager.rs
index 11b52697..41d6da59 100644
--- a/packages/oneclient_core/src/java/manager.rs
+++ b/packages/oneclient_core/src/java/manager.rs
@@ -260,7 +260,13 @@ async fn register_located_runtimes(
 	located: impl IntoIterator<Item = (PathBuf, JavaCheckInfo)>,
 ) -> LauncherResult<()> {
 	for (path, info) in located {
-		let _ = persist_runtime(pool, &path, &info).await?;
+		if let Err(err) = persist_runtime(pool, &path, &info).await {
+			tracing::warn!(
+				path = %path.display(),
+				version = %info.version,
+				"skipping located Java runtime: {err}"
+			);
+		}
 	}
 	Ok(())
 }